How to increase IR transmitting distance?

Discussion in 'Embedded Systems and Microcontrollers' started by dhanasingaraja, Nov 25, 2011.

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  1. dhanasingaraja

    Thread Starter New Member

    Nov 25, 2011
    I'm doing a bidirectional visitor counter.i m using TSOP 1738 at receiver side,and 38KHZ astable multivibrator at transmitter side.everything works fine.but it can't work if the distance between Tx,Rx is above 8cm.It's very short distance,so i can't use it in real time.I picked up sony IR LED from my old TV also it can't works for long diastance.I have attached my circuit diagram.I have used R1=1k,R2=1.394k,c=0.01up.
    please...... help me!
  2. Wendy


    Mar 24, 2008
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